Publication: BRN2 is a non-canonical melanoma tumor-suppressor
Authors
Hamm, Michael ; Sohier, Pierre ; Petit, Valérie ; Raymond, Jérémy H. ; Delmas, Véronique ; Le Coz, Madeleine ; Gesbert, Franck ; Kenny, Colin ; Aktary, Zackie ; Pouteaux, Marie ; Rambow, Florian ; Sarasin, Alain ; Charoenchon, Nisamanee ; Bellacosa, Alfonso ; Sanchez del Campo Ferrer, Luis ; Mosteo, Laura ; Lauss, Martin ; Meijer, Dies ; Steingrimsson, Eirikur ; Jönsson, Göran B. ; Cornell, Robert ; Davidson, Irwin ; Goding, Colin R. ; Larue, Lionel
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Springer Nature
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Description
©2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ This document is the Published Manuscript version of a Published Work that appeared in final form in Nature Communications. To access the final edited and published work see https://doi.org/10.1038/s41467-021-23973-5
Abstract
While the major drivers of melanoma initiation, including activation of NRAS/BRAF and loss of PTEN or CDKN2A, have been identified, the role of key transcription factors that impose altered transcriptional states in response to deregulated signaling is not well understood. The POU domain transcription factor BRN2 is a key regulator of melanoma invasion, yet its role in melanoma initiation remains unknown. Here, in a BrafV600E PtenF/+ context, we show that BRN2 haplo-insufficiency promotes melanoma initiation and metastasis. However, metastatic colonization is less efficient in the absence of Brn2. Mechanistically, BRN2 directly induces PTEN expression and in consequence represses PI3K signaling. Moreover, MITF, a BRN2 target, represses PTEN transcription. Collectively, our results suggest that on a PTEN heterozygous background somatic deletion of one BRN2 allele and temporal regulation of the other allele elicits melanoma initiation and progression
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